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Topic: Diacetylene

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	Diacetylene time-temperature indicators - Patent 4228126
		Techniques are also described for deactivating the active phase of a diacetylene after use, by adding an inhibitor, changing the temperature, or by applying a mechanical stress in order to decrease the thermal reactivity and permanently record the integrated time-temperature history obtained.
		Also provided is a process for preparing an inactive form of a diacetylenic compound, substantially free of any active forms, comprising dissolving said diacetylenic compound in a solvent therefor, and precipitating said compound from the solution at a sufficiently greater rate than the rate of precipitation of an active form of said compound.
		The indicator containing the inactive form of the diacetylene may also contain a binder material such as an epoxy glue, lacquer or shellac to adhere the diacetylene crystals into a suitable medium to be placed onto the substrate.
	www.freepatentsonline.com /4228126.html (5465 words)

	Patent 6,984,528 (Site not responding. Last check: 2007-10-10)
		In this embodiment the polydiacetylene is formed from polymerizing a three-dimensional or two-dimensional array of diacetylenes comprising a mixture of diacetylenes and of diacetylenes with the ligand or reactive substrate moieties attached covalently to the polymerizable diacetylene group.
		Diacetylene and polydiacetylene liposomes may be attached to, supported on, or absorbed in, solids, including, but not limited to: polymers such as polystyrene, polycarbonate, polyethylene, polypropylene and polyfluorocarbons such as Teflon®; silicon chips; beads; filters and membranes; glass; gold; silica; sephadex; sepharose; porous or swelling solids such as polyacrylates and polyacetonitrile; and sol-gels.
		The diacetylene 2-dimensional and 3-dimensional structures are photopolymerized with UV light, or γ-radiation, to give organized polydiacetylenes with the longer conjugation lengths characterized by absorption maximum in the range of 500-800 nm, preferably in the range 600-750 nm, and a blue to purple color.
	www.pharmcast.com /Patents100/Yr2006/Jan2006/011006/6984528_Fluorescence011006.htm (4079 words)

	U.S. Patent: 6194529 - Ordered polyacetylenes and process for the preparation thereof - February 27, 2001
		Diacetylenes polymerize to give systems with electrical and optical properties that can potentially be exploited for a variety of important applications.
		In particular, to a process wherein the diacetylene oxyhalide is an diacyl dihalide and the ordered polyacetylene compound has two alkyl amide groups positioned at each of the opposed ends of the diacetylene dioxy group.
		In a particular embodiment, the diacetylene oxyhalide is a diacetylene dioxy halide and the ordered polyacetylene has two alkylamide groups positioned at each of the opposed ends of acetylene dioxy group.
	www.everypatent.com /comp/pat6194529.html (7801 words)

	Diacetylene segmented copolymers - Patent 4721769
		The presence of the reactive diacetylene groups within the phase separated domains of the elastomer affords a relatively easy way to modify the mechanical properties of the elastomer by controlling the extent of cross-polymerization of these units.
		Since the diacetylene groups reside mostly in a separate phase, the flexible elastomeric segments of the copolymer will not be affected by the cross-polymerized reaction.
		Thus, modification of the mechanical properties of the elastomer is a result of a "hardening" of the discontinuous diacetylene domains of the copolymer which are dispersed throughout the continuous soft matrix.
	www.freepatentsonline.com /4721769.html (5572 words)

	ETH Zürich - Frauenrath Group - Literature Surveys and Reviews
		In an attempt to circumvent this constraint, the use of perfluorophenyl/phenyl-substituted diacetylenes was investigated [6].
		Attempts to polymerize diacetylenes in LC phases have also been reported [10], but turned out to be successful only in a few cases [11].
		Diacetylene polymerization in self-assembled mono-, bi- and multilayers of long chain diynoic acids and their salts prepared with the Langmuir-Blodgett technique was first reported by Tieke, Wegner et al.
	www.polychem.mat.ethz.ch /frauenrath/index.php?page=literature&subpage=topochemical (1281 words)

	PC/Tieke
		The polydiacetylene (1b) chosen for the multilayer built-up is obtained by gamma-irradiation of the correspondent diacetylene monomer 1a.
		It is found that all diacetylene derivatives are well suited for building up self-assembled multilayers and that two of the monomers (1a, 2) can be polymerized on the substrate, while 3 is photoinactive.
		The smoothest surface topology is found for multilayers built up of the polydiacetylene 1b and a cationic polyelectrolyte in alternate sequence, while the largest unevenness is found, when the anionic diacetylene 1a is alternatingly adsorbed with the cationic bolaamphiphile 3 followed by subsequent UV-polymerization on the substrate.
	www.uni-koeln.de /math-nat-fak/phchem/tieke/pubs/pap22.html (205 words)

	NSDL Metadata Record -- Two-dimensional polymer synthesis : towards a two-dimensional replicating system for ...
		One possible implementation of a 2-D replicating system is pursued which uses a diacetylene moiety for cross-linking and amide hydrogen bonding for molecular recognition between replicates and templates.
		The assembly and crosslinking of diacetylene monomers on an underlying amide-capped self- assembled monolayer (SAM) was studied on unpatterned thermally evaporated gold films.
		Raman and Fourier-transform infrared spectroscopies, as well as ellipsometry and contact angle data, indicate that amide hydrogen bonding interactions are sufficient to organize an adlayer of diacetylene-containing molecules on the underlying SAM which can be polymerized with ultraviolet light.
	nsdl.org /mr/2665821 (380 words)

	Optical recording-reproducing method and device by using the same - Patent # 4910107 - PatentGenius
		An optical recording-reproducing method according to claim 12, wherein the weight ratio of the diacetylene derivative compound to the compound of said group B in the recording layer of said mixed monomolecular film or built-up mixedmonomolecular film is about 1/15 to 15/1.
		The polydiacetylene derivative compound is obtained by polymerization of the diacetylene derivative represented by the above formula and it is generally contained in the optical recording medium in the form of a DA compound during manufacture ofoptical recording medium, and polymerized by irradiation of UV-ray prior to practicing recording and then provided for recording.
		Without use of the diacetylene derivative compound, by use of a solution of 1 part by weight of the diene compound salt and 1 part by weight of nitrocellulose in 4 parts by weight of methylene chloride as the coating solution, an opticalrecording medium having a recording layer of 1000.ANG.
	www.patentgenius.com /patent/4910107.html (11674 words)

	OhioLINK ETD: Shih, Raymond
		A Brewster angle microscope was used to study the Langmuir film of 12-8 diacetylene acid during the compression process on the liquid interface.
		The polymerized 12-8 diacetylene acid film also appeared to be oriented on the surface along the deposition direction, but the film is very rough, RMS increases to as much as 40 A from several angstroms.
		Linear polymerization of 12-8 diacetylene acid monomer film can be obtained by exposing the monolayer samples to a polarized UV light source.
	www.ohiolink.edu /etd/view.cgi?case1061473845 (394 words)

	Influence of Substrate Properties on the Topochemical Polymerization of Diacetylene Monolayers
		The influence of the underlying substrate on the UV initiated polymerization of diacetylene lipid monolayers was investigated using absorption spectroscopy and Brewster angle microscopy (BAM).
		In agreement, when the lipid/substrate interactions were reduced, either by introducing a cadmium arachidate bilayer between the diacetylene film and the glass or by substituting mica for glass, a limited polymerization occurred, forming the red film exclusively.
		By investigating polymerization as a function of substrate and headgroup chemistry, several factors influencing the lability of diacetylene films toward topochemical polymerization are presented.
	pubs.acs.org /cgi-bin/abstract.cgi/langd5/2001/17/i12/abs/la001240v.html (304 words)

	Process for producing a polyacetylene (Site not responding. Last check: 2007-10-10)
		A process for producing a polyacetylene according to claim 5, wherein the substance containing a diacetylene group is pentacosadiynoic acid.
		gathering up molecules of the substance containing a diacetylene group which remain on the water surface, in the water surface direction on the water surface by means of a barrier, and
		A process for producing a polyacetylene according to claim 9, wherein the substance containing a diacetylene group is pentacosadiynoic acid.
	www.well.com /~ulee/power_drivable_chuck/process_producing_polyacetylene.html (540 words)

	IMAGING FILM
		The film is not sensitive to ambient (white) light and therefore can be handled in ordinary room light, eliminating the need for darkrooms and related equipment.
		The diacetylenes used in the film are non-toxic and contains no heavy metals.
		The diacetylene film is particularly sensitive to certain levels of high energy radiation including short wavelength UV light.
	www.jplabs.com /html/imaging_film.html (337 words)

	Avanti Polar Lipids
		The diacetylenic lipid 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine is patented and Avanti has obtained worldwide rights to manufacture and distribute this molecule.
		photopolymerization of diacetylenic lipids is topotactic, thus the rate of polymerization depends
		where the diacetylenic groups are diluted by other non-polymerizable lipids.
	www.avantilipids.com /PolymersDiacetylenePhospholipids.asp (582 words)

	Diffusion in Uranus Atmosphere
		At the bottom of the atmosphere, where the temperature warms significantly and transitions to the Uranian interior, the condensed crystals evaporate and devolve into the constituent methane and other parts.
		In regions of the atmosphere where the temperature is cooler, these gases condense to form droplets of haze and smog.
		At the bottom of the atmosphere, where the temperature warms up and changes to the Uranian interior, the molecules evaporate and break apart again into the methane and other parts which made it in the first place.
	www.windows.ucar.edu /uranus/atmosphere/clouds/U_atm_motions_diffusion.html (566 words)

	New Class Of Polymeric Membranes Could Expand Gas Separation Applications Through Improved Thermal And Chemical ...
		At the 214th national meeting of the American Chemical Society September 9 in Las Vegas, NV, researchers from the Georgia Institute of Technology reported on improved thermal and chemical resistance in gas separation membranes produced by blending polyimide materials containing crosslinkable diacetylene groups.
		But Beckham and his graduate students have produced a series of other diacetylene-containing polyimides to determine whether these special properties may be found in similar -- and less costly -- polyimide materials.
		"Incorporating diacetylene groups into linear chain backbones to crosslink polymers is not itself novel," he added.
	www.eurekalert.org /pub_releases/1997-09/GIoT-NCOP-030997.php (873 words)

	Homepage des Arbeitskreises Prof. B. Tieke
		[A3] B. Tieke, G. Wegner; "The Quantum Yield of the Topochemical Polymerization of Diacetylenes in Multilayers", Makromol.
		[A10] J.P. Fouassier, B. Tieke, G. Wegner; "The Photochemistry of the Polymerization of Diacetylenes in Multilayers", Isr.
		Wegner; "Cyanine Dyes as Sensitizers of the Photopolymerization of Diacetylenes in Multilayers".,Ber.
	www.uni-koeln.de /math-nat-fak/phchem/tieke/pubs/pubsalt.html (1308 words)

	International University Bremen: Research Projects Started at the University of Würzburg (Site not responding. Last check: 2007-10-10)
		Some diacetylene monomers crystalize forming monoclinic crystal lattices.
		An exact characterization of the polymer chains formed during the solid-state polymerization of different diacetylenes is performed by the combination of optical spectroscopical methods.
		The distribution of chain lenghts can be determined and the influence of crystal defects on the delocalized electrons of the conjugated bonding system of the polymer backbones is explained.
	www.iu-bremen.de /schools/ses/amaterny/06571/print.php (1284 words)

	Ultraviolet Photochemistry of Diacetylene: Reactions with Benzene and Toluene
		Ultraviolet Photochemistry of Diacetylene: Reactions with Benzene and Toluene
		The reactions of metastable diacetylene with benzene and toluene are explored using a molecular beam pump-probe time-of-flight mass spectrometer.
		The reactions are quenched as the gas mixture expands into the ion source region of a time-of-flight mass spectrometer where the primary photoproducts are detected using vacuum ultraviolet (VUV) photoionization or resonant two-photon ionization (R2PI).
	pubs.acs.org /cgi-bin/abstract.cgi/jpcafh/2000/104/i45/abs/jp001427v.html (232 words)

	White-Beam Synchrotron X-ray Topography (WBSXT) of Diacetylene Single Crystals and Bicrystals (Site not responding. Last check: 2007-10-10)
		The diacetylene bicrystals were designed to have single grain boundary defects with controlled geometries.
		The WBSXT data provides information about the diacetylene crystal structure and structural evolution during the radiation-induced solid-state polymerization reaction.
		By controlling and quantifying the exposure to the X-ray beam, it is possible to monitor the change in structure during polymerization in detail.
	flux.aps.org /meetings/BAPSMAR96/abs/S260003.html (175 words)

	COLL 409 - Polymerization of diacetylene self-assembled monolayers confined in molecule corrals
		COLL 409 - Polymerization of diacetylene self-assembled monolayers confined in molecule corrals
		Polymerization of diacetylene self-assembled monolayers confined in molecule corrals
		Albert Schnieders, ION-TOF USA, Inc, Chestnut Ridge, NY 10977 and Thomas P. Beebe Jr.
	membership.acs.org /c/coll/neworleans/P626096.HTM (221 words)

	Frank Fowler
		Polymers of the diacetylene functionality are interesting materials because their extensively conjugated pi-systems imparts to them useful optical and electrical properties.
		Participants in this project mustbecome skilled in understanding the weak forces that assemble molecules, instrumental techniques for analyzing the structure of the organic solid state, and modern methods of synthetic chemistry.
		The crystal structure of ureylene dicarboxylic acid and a dipyridyl diacetylene derivative properly oriented for a topochemically controlled polymerization.
	www.sunysb.edu /chemistry/faculty/ffowler.htm (382 words)

	IFT
		The device is composed of (1) a partially polymerized diacetylene, (2) a polymeric gel and (3) a solvent, e.g., ethylene glycol diacetate.
		When the temperature of the device is lowered below the freezing point of water, ethylene glycol diacetate phase separates out of the mixture and induces an irreversible color change, e.g., blue-to-red, in the diacetylene.
		Varying the ratio of water to ethylene glycol diacetate and concentration of the polymer varies the temperature and time required for the color change.
	www.jplabs.com /html/ift.html (256 words)

	Martin Research Group - University of Michigan - Publications
		Dynamic transmission electron microscopy of the [1,6-di(N-carbazolyl)-2,4-hexadiyne] diacetylene monomer-polymer phase transformation (vol 74, pg 195, 1996).
		Crystal growth and textured microstructures of 1,6-di(N-carbazolyl)-2,4 hexadiyne diacetylene.
		Construction and characterization of [1,6-Di(N-carbazolyl)-2,4-hexadiyne] diacetylene polymer bicrystals.
	msewww.engin.umich.edu:81 /people/milty/publications.php (756 words)

	[46.02] Aromatic Ring Forming Reactions of Cyanoacetylene and Diacetylene. Applications to Titan's Atmosphere (Site not responding. Last check: 2007-10-10)
		Diacetylene and cyanoacetylene are the largest hydrocarbon and nitrile yet identified on Titan.
		In previous experiments with diacetylene this group has identified benzene and phenylacetylene as initial products of the diacetylene plus butadiene reaction.
		These reactions are important in developing a further understanding of the chemical processes which may lead to the formation of the visible absorbing haze on Titan.
	www.aas.org /publications/baas/v30n3/dps98/478.htm (125 words)

	Clarkson University - Calendar
		Using the EISA approach, we synthesized conjugated polymer/silica nanocomposites with hexagonal, cubic, or lamellar mesoscopic order, using polymerizable amphiphilic diacetylene molecules as both structure-directing agents and monomers.
		By tailoring the size of the oligo(ethylene glycol) headgroup of the diacetylene-containing surfactant, the resulting self-assembled mesophases of the composite material were varied.
		The nanostructured inorganic host altered the diacetylene polymerization behavior, and the resulting nanocomposites show unique thermo-, mechano-, and solvato-chromic properties.
	www.clarkson.edu /calendar/index.php?entry_id=374 (472 words)

	IngentaConnect Synthesis and Polymerization Behavior of Tridentate Diacetylene H... (Site not responding. Last check: 2007-10-10)
		IngentaConnect Synthesis and Polymerization Behavior of Tridentate Diacetylene H...
		The base and the arm unit are each either a 2,6-disubstituted pyridine or a 2,5-disubsituted thiophene ring.
		The terminal end of each arm unit is connected to a (butoxycarbonyl)methylurethanyl (BCMU) moiety by way of a diacetylene linkage.
	www.ingentaconnect.com /content/klu/jpol/2006/00000013/00000002/00009015 (200 words)

	Jianghong Wang
		The syntheses of a soluble diacetylene and its polymer with push-pull azobenzene and pyrimidine ring attached.
		Theoretical studies on the nonlinear optical properties of new diacetylene derivatives with azobenzene substituents.
		Synthesis and characterization of nonlinear optical material of substituted diacetylenes with azophenyl group and pyrimidine ring.
	www.webspawner.com /users/wangjianghong2003/aboutorbitbioch.html (1197 words)

	Amazon.com: "diacetylene derivatives": Key Phrase page (Site not responding. Last check: 2007-10-10)
		Wegner and coworkers it is known that diacetylene derivatives are able to undergo a topochemical 1,4-addition polymerization if exposed to UV or high energy radiation:3o R' v n R-C_C-C=C-R'...
		Single crystals of some diacetylene derivatives can be photopolymerized to produce long conjugated chains within the crystal.
		Subsequent work has involved further characterization of diacetylene (and polydiacetylene) SAMs, and the formation of self-assembled multi layers of various diacetylene derivatives [52-54].
	www.amazon.com /phrase/diacetylene-derivatives (590 words)

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